2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 #define C(f, tbl, tgt, name) \
24 { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_TARGET_##tgt, name }
27 enum fw3_family family
;
29 enum fw3_target target
;
33 static const struct chain src_chains
[] = {
34 C(ANY
, FILTER
, UNSPEC
, "zone_%s_input"),
35 C(ANY
, FILTER
, UNSPEC
, "zone_%s_output"),
36 C(ANY
, FILTER
, UNSPEC
, "zone_%s_forward"),
38 C(ANY
, FILTER
, ACCEPT
, "zone_%s_src_ACCEPT"),
39 C(ANY
, FILTER
, REJECT
, "zone_%s_src_REJECT"),
40 C(ANY
, FILTER
, DROP
, "zone_%s_src_DROP"),
43 static const struct chain dst_chains
[] = {
44 C(ANY
, FILTER
, ACCEPT
, "zone_%s_dest_ACCEPT"),
45 C(ANY
, FILTER
, REJECT
, "zone_%s_dest_REJECT"),
46 C(ANY
, FILTER
, DROP
, "zone_%s_dest_DROP"),
48 C(V4
, NAT
, SNAT
, "zone_%s_postrouting"),
49 C(V4
, NAT
, DNAT
, "zone_%s_prerouting"),
51 C(ANY
, FILTER
, CUSTOM_CHAINS
, "input_%s_rule"),
52 C(ANY
, FILTER
, CUSTOM_CHAINS
, "output_%s_rule"),
53 C(ANY
, FILTER
, CUSTOM_CHAINS
, "forwarding_%s_rule"),
55 C(V4
, NAT
, CUSTOM_CHAINS
, "prerouting_%s_rule"),
56 C(V4
, NAT
, CUSTOM_CHAINS
, "postrouting_%s_rule"),
59 const struct fw3_option fw3_zone_opts
[] = {
60 FW3_OPT("enabled", bool, zone
, enabled
),
62 FW3_OPT("name", string
, zone
, name
),
63 FW3_OPT("family", family
, zone
, family
),
65 FW3_LIST("network", device
, zone
, networks
),
66 FW3_LIST("device", device
, zone
, devices
),
67 FW3_LIST("subnet", address
, zone
, subnets
),
69 FW3_OPT("input", target
, zone
, policy_input
),
70 FW3_OPT("forward", target
, zone
, policy_forward
),
71 FW3_OPT("output", target
, zone
, policy_output
),
73 FW3_OPT("masq", bool, zone
, masq
),
74 FW3_LIST("masq_src", address
, zone
, masq_src
),
75 FW3_LIST("masq_dest", address
, zone
, masq_dest
),
77 FW3_OPT("extra", string
, zone
, extra_src
),
78 FW3_OPT("extra_src", string
, zone
, extra_src
),
79 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
81 FW3_OPT("conntrack", bool, zone
, conntrack
),
82 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
83 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
85 FW3_OPT("log", bool, zone
, log
),
86 FW3_OPT("log_limit", limit
, zone
, log_limit
),
93 print_chains(enum fw3_table table
, enum fw3_family family
,
94 const char *fmt
, const char *name
, uint16_t targets
,
95 const struct chain
*chains
, int n
)
99 const struct chain
*c
;
101 for (c
= chains
; n
> 0; c
++, n
--)
103 if (!fw3_is_family(c
, family
))
106 if (c
->table
!= table
)
109 if ((c
->target
!= FW3_TARGET_UNSPEC
) && !hasbit(targets
, c
->target
))
112 snprintf(cn
, sizeof(cn
), c
->name
, name
);
122 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, enum fw3_target def
,
125 if (*pol
== FW3_TARGET_UNSPEC
)
127 warn_elem(e
, "has no %s policy specified, using default", name
);
130 else if (*pol
> FW3_TARGET_DROP
)
132 warn_elem(e
, "has invalid %s policy, using default", name
);
138 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
140 struct fw3_device
*net
, *tmp
;
142 list_for_each_entry(net
, &zone
->networks
, list
)
144 tmp
= fw3_ubus_device(net
->name
);
148 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
152 list_add_tail(&tmp
->list
, &zone
->devices
);
159 struct fw3_zone
*zone
;
161 zone
= malloc(sizeof(*zone
));
166 memset(zone
, 0, sizeof(*zone
));
168 INIT_LIST_HEAD(&zone
->networks
);
169 INIT_LIST_HEAD(&zone
->devices
);
170 INIT_LIST_HEAD(&zone
->subnets
);
171 INIT_LIST_HEAD(&zone
->masq_src
);
172 INIT_LIST_HEAD(&zone
->masq_dest
);
174 zone
->enabled
= true;
175 zone
->custom_chains
= true;
176 zone
->log_limit
.rate
= 10;
182 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
184 struct uci_section
*s
;
185 struct uci_element
*e
;
186 struct fw3_zone
*zone
;
187 struct fw3_defaults
*defs
= &state
->defaults
;
189 INIT_LIST_HEAD(&state
->zones
);
191 uci_foreach_element(&p
->sections
, e
)
193 s
= uci_to_section(e
);
195 if (strcmp(s
->type
, "zone"))
198 zone
= fw3_alloc_zone();
203 fw3_parse_options(zone
, fw3_zone_opts
, s
);
211 if (!zone
->extra_dest
)
212 zone
->extra_dest
= zone
->extra_src
;
214 if (!defs
->custom_chains
&& zone
->custom_chains
)
215 zone
->custom_chains
= false;
217 if (!zone
->name
|| !*zone
->name
)
219 warn_elem(e
, "has no name - ignoring");
224 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
225 list_empty(&zone
->subnets
) && !zone
->extra_src
)
227 warn_elem(e
, "has no device, network, subnet or extra options");
230 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
231 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
232 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
234 resolve_networks(e
, zone
);
238 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
239 zone
->conntrack
= true;
242 if (zone
->custom_chains
)
244 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
245 setbit(zone
->dst_flags
, FW3_TARGET_DNAT
);
248 setbit(zone
->src_flags
, zone
->policy_input
);
249 setbit(zone
->dst_flags
, zone
->policy_output
);
250 setbit(zone
->dst_flags
, zone
->policy_forward
);
252 list_add_tail(&zone
->list
, &state
->zones
);
258 print_zone_chain(enum fw3_table table
, enum fw3_family family
,
259 struct fw3_zone
*zone
, struct fw3_state
*state
)
264 if (!fw3_is_family(zone
, family
))
267 setbit(zone
->dst_flags
, family
);
269 /* user chains already loaded, don't create again */
270 if (hasbit(zone
->dst_flags
, FW3_TARGET_CUSTOM_CHAINS
))
271 delbit(mask
, FW3_TARGET_CUSTOM_CHAINS
);
273 if (zone
->custom_chains
)
274 setbit(zone
->dst_flags
, FW3_TARGET_CUSTOM_CHAINS
);
276 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
277 setbit(zone
->dst_flags
, FW3_TARGET_NOTRACK
);
279 s
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
280 zone
->src_flags
& mask
,
281 src_chains
, ARRAY_SIZE(src_chains
));
283 d
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
284 zone
->dst_flags
& mask
,
285 dst_chains
, ARRAY_SIZE(dst_chains
));
287 if (zone
->custom_chains
)
289 if (table
== FW3_TABLE_FILTER
)
291 fw3_pr("-A zone_%s_input -j input_%s_rule "
292 "-m comment --comment \"user chain for %s input\"\n",
293 zone
->name
, zone
->name
, zone
->name
);
295 fw3_pr("-A zone_%s_output -j output_%s_rule "
296 "-m comment --comment \"user chain for %s output\"\n",
297 zone
->name
, zone
->name
, zone
->name
);
299 fw3_pr("-A zone_%s_forward -j forwarding_%s_rule "
300 "-m comment --comment \"user chain for %s forwarding\"\n",
301 zone
->name
, zone
->name
, zone
->name
);
303 else if (table
== FW3_TABLE_NAT
)
305 fw3_pr("-A zone_%s_prerouting -j prerouting_%s_rule "
306 "-m comment --comment \"user chain for %s prerouting\"\n",
307 zone
->name
, zone
->name
, zone
->name
);
309 fw3_pr("-A zone_%s_postrouting -j postrouting_%s_rule "
310 "-m comment --comment \"user chain for %s postrouting\"\n",
311 zone
->name
, zone
->name
, zone
->name
);
317 info(" * Zone '%s'", zone
->name
);
318 fw3_set_running(zone
, &state
->running_zones
);
323 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
324 struct fw3_zone
*zone
, struct fw3_device
*dev
,
325 struct fw3_address
*sub
, bool disable_notrack
)
329 #define jump_target(t) \
330 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
332 if (table
== FW3_TABLE_FILTER
)
334 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
336 if (hasbit(zone
->src_flags
, t
))
338 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
339 fw3_format_in_out(dev
, NULL
);
340 fw3_format_src_dest(sub
, NULL
);
341 fw3_format_extra(zone
->extra_src
);
342 fw3_pr(" -j %s\n", jump_target(t
));
345 if (hasbit(zone
->dst_flags
, t
))
347 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
348 fw3_format_in_out(NULL
, dev
);
349 fw3_format_src_dest(NULL
, sub
);
350 fw3_format_extra(zone
->extra_dest
);
351 fw3_pr(" -j %s\n", jump_target(t
));
355 fw3_pr("-A delegate_input");
356 fw3_format_in_out(dev
, NULL
);
357 fw3_format_src_dest(sub
, NULL
);
358 fw3_format_extra(zone
->extra_src
);
359 fw3_pr(" -j zone_%s_input\n", zone
->name
);
361 fw3_pr("-A delegate_forward");
362 fw3_format_in_out(dev
, NULL
);
363 fw3_format_src_dest(sub
, NULL
);
364 fw3_format_extra(zone
->extra_src
);
365 fw3_pr(" -j zone_%s_forward\n", zone
->name
);
367 fw3_pr("-A delegate_output");
368 fw3_format_in_out(NULL
, dev
);
369 fw3_format_src_dest(NULL
, sub
);
370 fw3_format_extra(zone
->extra_dest
);
371 fw3_pr(" -j zone_%s_output\n", zone
->name
);
373 else if (table
== FW3_TABLE_NAT
)
375 if (hasbit(zone
->dst_flags
, FW3_TARGET_DNAT
))
377 fw3_pr("-A delegate_prerouting");
378 fw3_format_in_out(dev
, NULL
);
379 fw3_format_src_dest(sub
, NULL
);
380 fw3_format_extra(zone
->extra_src
);
381 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
384 if (hasbit(zone
->dst_flags
, FW3_TARGET_SNAT
))
386 fw3_pr("-A delegate_postrouting");
387 fw3_format_in_out(NULL
, dev
);
388 fw3_format_src_dest(NULL
, sub
);
389 fw3_format_extra(zone
->extra_dest
);
390 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
393 else if (table
== FW3_TABLE_MANGLE
)
400 fw3_format_in_out(NULL
, dev
);
401 fw3_format_src_dest(NULL
, sub
);
402 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
403 fw3_format_limit(&zone
->log_limit
);
404 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
405 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
409 fw3_format_in_out(NULL
, dev
);
410 fw3_format_src_dest(NULL
, sub
);
411 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
412 fw3_format_comment(zone
->name
, " (mtu_fix)");
413 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
416 else if (table
== FW3_TABLE_RAW
)
418 if (!zone
->conntrack
&& !disable_notrack
)
420 fw3_pr("-A notrack");
421 fw3_format_in_out(dev
, NULL
);
422 fw3_format_src_dest(sub
, NULL
);
423 fw3_format_extra(zone
->extra_src
);
424 fw3_format_comment(zone
->name
, " (notrack)");
425 fw3_pr(" -j CT --notrack\n", zone
->name
);
431 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
432 struct fw3_zone
*zone
, bool disable_notrack
)
434 struct fw3_device
*dev
;
435 struct fw3_address
*sub
;
437 fw3_foreach(dev
, &zone
->devices
)
438 fw3_foreach(sub
, &zone
->subnets
)
440 if (!fw3_is_family(sub
, family
))
446 print_interface_rule(table
, family
, zone
, dev
, sub
, disable_notrack
);
451 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
452 struct fw3_zone
*zone
, bool disable_notrack
)
454 struct fw3_address
*msrc
;
455 struct fw3_address
*mdest
;
459 if (!fw3_is_family(zone
, family
))
464 case FW3_TABLE_FILTER
:
465 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
466 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
468 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
469 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
471 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
472 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
476 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
478 if (hasbit(zone
->src_flags
, t
))
480 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
481 fw3_format_limit(&zone
->log_limit
);
482 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
483 fw3_flag_names
[t
], zone
->name
);
486 if (hasbit(zone
->dst_flags
, t
))
488 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
489 fw3_format_limit(&zone
->log_limit
);
490 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
491 fw3_flag_names
[t
], zone
->name
);
498 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
500 fw3_foreach(msrc
, &zone
->masq_src
)
501 fw3_foreach(mdest
, &zone
->masq_dest
)
503 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
504 fw3_format_src_dest(msrc
, mdest
);
505 fw3_pr("-j MASQUERADE\n");
511 case FW3_TABLE_MANGLE
:
515 print_interface_rules(table
, family
, zone
, disable_notrack
);
519 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
520 struct fw3_state
*state
)
522 struct fw3_zone
*zone
;
524 list_for_each_entry(zone
, &state
->zones
, list
)
525 print_zone_chain(table
, family
, zone
, state
);
529 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
530 struct fw3_state
*state
)
532 struct fw3_zone
*zone
;
534 list_for_each_entry(zone
, &state
->zones
, list
)
535 print_zone_rule(table
, family
, zone
, state
->defaults
.drop_invalid
);
539 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
540 bool pass2
, bool reload
, struct fw3_state
*state
)
542 struct fw3_zone
*z
, *tmp
;
544 uint16_t families
= (1 << FW3_FAMILY_V4
) | (1 << FW3_FAMILY_V6
);
546 /* don't touch user chains on selective stop */
548 delbit(mask
, FW3_DEFAULT_CUSTOM_CHAINS
);
550 list_for_each_entry_safe(z
, tmp
, &state
->running_zones
, running_list
)
552 if (!hasbit(z
->dst_flags
, family
))
555 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
556 z
->name
, z
->src_flags
& mask
,
557 src_chains
, ARRAY_SIZE(src_chains
));
559 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
560 z
->name
, z
->dst_flags
& mask
,
561 dst_chains
, ARRAY_SIZE(dst_chains
));
565 delbit(z
->dst_flags
, family
);
567 if (!(z
->dst_flags
& families
))
568 fw3_set_running(z
, NULL
);
574 fw3_lookup_zone(struct fw3_state
*state
, const char *name
, bool running
)
578 if (list_empty(&state
->zones
))
581 list_for_each_entry(z
, &state
->zones
, list
)
583 if (strcmp(z
->name
, name
))
586 if (!running
|| z
->running_list
.next
)